Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/WriteEntryOpInfo.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 package org.dancres.blitz.entry;
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2
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3 import java.io.IOException;
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4
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5 import java.util.logging.*;
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6
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7 import net.jini.entry.AbstractEntry;
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8 import org.dancres.blitz.disk.DiskTxn;
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9
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10 import org.dancres.blitz.mangler.MangledEntry;
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11 import org.dancres.blitz.mangler.EntryMangler;
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12
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13 import org.dancres.blitz.txn.TxnState;
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14
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15 import org.dancres.blitz.oid.OID;
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16
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17 import org.dancres.blitz.arc.CacheBlockDescriptor;
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18 import org.dancres.blitz.arc.RecoverySummary;
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19
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20 class WriteEntryOpInfo implements OpInfo {
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21 static final long serialVersionUID = -6227846450032402193L;
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22
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23 private OID theOID;
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24 private MangledEntry theEntry;
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25 private long theInitialExpiry;
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26
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27 private transient boolean wasOnDisk;
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28
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29 WriteEntryOpInfo(EntrySleeveImpl aSleeve) {
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30 theOID = aSleeve.getOID();
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31 theInitialExpiry = aSleeve.getExpiry();
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32 theEntry = aSleeve.getEntry();
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33 }
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34
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35 public boolean isDebugOp() {
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36 // Write's are never false though they can be aborted
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37 //
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38 return false;
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39 }
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40
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41 public void restore() throws IOException {
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42 EntryReposRecovery myRepos =
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43 EntryRepositoryFactory.get().getAdmin(theEntry.getType());
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44
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45 if (myRepos == null) {
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46 SleeveCache.theLogger.log(Level.SEVERE, "Yikes couldn't getAdmin");
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47 throw new IOException("Couldn't getAdmin");
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48 }
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49
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50 if (myRepos.noSchemaDefined()) {
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51 DiskTxn myTxn = DiskTxn.newTxn();
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52
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53 myRepos.setFields(theEntry.getFields());
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54
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55 /*
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56 Update parent repositories - each parent needs to know about
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57 this subtype
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58 */
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59 String[] myParents = theEntry.tearOffParents();
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60
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61 for (int i = 0; i < myParents.length; i++) {
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62 EntryRepository myParentRepos =
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63 EntryRepositoryFactory.get().get(myParents[i]);
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64 myParentRepos.addSubtype(theEntry.getType());
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65 }
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66
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67 myTxn.commit();
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68 }
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69
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70 EntrySleeveImpl mySleeve =
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71 new EntrySleeveImpl(theOID, theEntry, theInitialExpiry);
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72
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73 RecoverySummary mySummary = myRepos.recover(mySleeve);
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74
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75 // If the entry was on disk, instance counts are already up-to-date
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76 // so we don't want to count the entry twice
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77 //
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78 wasOnDisk = mySummary.wasOnDisk();
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79
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80 mySummary.getCBD().release();
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81 }
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82
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83 public MangledEntry commit(TxnState aState) throws IOException {
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84 MangledEntry myEntry = null;
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85
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86 EntryReposRecovery myRepos =
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87 EntryRepositoryFactory.get().getAdmin(theEntry.getType());
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88
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89 CacheBlockDescriptor myCBD = myRepos.load(theOID);
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90
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91 if (myCBD != null) {
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92 EntrySleeveImpl mySleeve = (EntrySleeveImpl) myCBD.getContent();
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93
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94 mySleeve.getState().clear(SleeveState.PINNED);
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95
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96 /**
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97 * If Entry is deleted, lease has expired or we've taken it in
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98 * the same transaction as this write. In those cases, we don't
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99 * want to generate any events so we return null. Note that
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100 * ENTRY_WRITE is generated elsewhere and thus writes remain
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101 * visible event wise within transaction scope (i.e. for notify's
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102 * on the transaction).
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103 */
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104 if (! mySleeve.getState().test(SleeveState.DELETED)) {
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105 myEntry = theEntry;
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106 // System.err.println("Wrote: " + theOID);
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107 }
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108
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109 /*
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110 If it wasOnDisk we needn't mark it dirty otherwise we must to
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111 ensure the data reaches disk. We needn't mark it dirty any
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112 earlier because if we crash prior to this stage, the Entry
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113 shouldn't be written anyways.
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114 */
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115 if (!wasOnDisk)
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116 mySleeve.markDirty();
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117
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118 myCBD.release();
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119 }
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120
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121 // Update counters outside of lock
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122 if (!wasOnDisk)
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123 myRepos.getCounters().didWrite();
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124
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125 return myEntry;
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126 }
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127
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128 public MangledEntry abort(TxnState aState) throws IOException {
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129 EntryReposRecovery myRepos =
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130 EntryRepositoryFactory.get().getAdmin(theEntry.getType());
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131
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132 CacheBlockDescriptor myCBD = myRepos.load(theOID);
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133
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134 if (myCBD != null) {
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135 EntrySleeveImpl mySleeve = (EntrySleeveImpl) myCBD.getContent();
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136
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137 mySleeve.getState().set(SleeveState.DELETED);
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138 mySleeve.getState().clear(SleeveState.PINNED);
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139
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140 /*
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141 Write has been aborted, we need to ensure we do appropriate
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142 cleanup.
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143 */
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144 mySleeve.markDirty();
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145
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146 myCBD.release();
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147 }
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148
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149 return null;
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150 }
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151
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152 public OID getOID() {
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153 return theOID;
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154 }
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155
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156 public String getType() {
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157 return theEntry.getType();
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158 }
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159
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160 public String toString() {
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161 String myEntryRep = "Unusable";
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162
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163 try {
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164 myEntryRep =
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165 AbstractEntry.toString(
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166 EntryMangler.getMangler().unMangle(theEntry));
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167 } catch (Exception anE) {
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168 // Nothing to do
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169 myEntryRep = myEntryRep + ": " + anE.getClass();
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170 }
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171
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172 return "W : " + theEntry.getType() + " : " + theOID + " : " +
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173 theInitialExpiry + " : " + theEntry.sizeOf() + " : " +
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174 theEntry.getCodebase() + " [ " + myEntryRep + " ]";
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175 }
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176 }